There's a lot of new Pokemon like the Gen 2 starters Chikorita, Cyndaquil and Totodile, but also a number of evolutions for existing Pokemon from Gen 1.

For instance, Golbat can now evolve into Crobat, Slowpoke can evolve into Slowking, Onix can evolve into Steelix, Chansey can evolve into Blissey, Seadra can evolve into Kingdra, Scyther can evolve into Scizor, Eevee can evolve into Espeon and Umbreon, and Porygon can evolve into Porygon 2.

However, in some cases, these evolutions require much more than Pokemon candy to get the job done as you'll also need some newly introduced special items.

This could be one of the following: A King's Rock, Sun Stone, Metal Coat, Dragon Scale or up-grade item.

Where do you get these you ask? The same place you get most items, from Pokestops.

Currently, the only way you'll acquire these is by pure pot luck at Pokestops out and about. Which means a lot more walking.

Pokemon GO Gen 2 Evolutions: How to get Umbreon, Espeon, Steelix, Blissey, Scizor and more

Take a look at all the existing evolutions of Gen 1 Pokemon. This includes Gen 2 Umbreon, Espeon, Bellossom, Politoed, Crobat, Slowking, Steelix, Blissey, Kingdra, Scizor and Porygon 2.

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POKEMON GO GEN 2 EVOLUTIONS

Golbat into Crobat - 100 candy is all you need

Slowpoke into Slowking - You'll need to obtain a King's Rock item from a Pokestop, which is used together with 50 candy

Onix into Steelix - You'll need to obtain a Metal Coat item from a Pokestop, which is used together with 50 Onix candy

Gloom into Bellossom - You'll need to obtain a Sun Stone item from a Pokestop, which is used together with 100 candy

Chansey into Blissey - 50 candy is all you need

Poliwhirl into Politoed - You'll need to obtain a King's Rock item from a Pokestop, which is used together with 100 candy

Seadra into Kingdra - You'll need to obtain a Dragon Scale item from a Pokestop, which is used together with 100 candy

Scyther into Scizor - You'll need to obtain a Metal Coat item from a Pokestop, which is used together with 50 Scyther candy

Porygon into Porygon 2 - You'll need to obtain a Up-Grade item from a Pokestop, which is used together with 50 candy

In addition to the new Pokemon and evolutions, there's also new encounters, berries, avatar clothing and medals to collect. Full details can be found below, along with the official patch notes.

New Encounter Gameplay: When you encounter Pokémon in the wild, don’t be surprised if they react in new ways as you’re trying to catch them. You’ll also notice the addition of new item carousels that allow you to select Berries and Poké Balls directly from the encounter screen. Hone your skills and catch those elusive Pokémon!

New Berries: Pokémon enjoy eating Berries, and you’ll have the opportunity to get two new Berries by spinning the Photo Disc at PokéStops—Nanab Berries and Pinap Berries! Giving a Pokémon a Nanab Berry will slow its movements, making it easier to catch. The Pinap Berry doubles the amount of Candy you’ll receive if your next catch attempt succeeds.

New Avatars and an Expanded Wardrobe: Now you’ll be able to give your avatar a complete upgrade! Customise your look with a whole new selection of hats, shirts, pants, and other items.

Here are the new Pokemon GO patch notes:

Over 80 additional Pokémon originally discovered in the Johto region can be caught.